91509345 has 20 divisors (see below), whose sum is σ = 164039700. Its totient is φ = 48804768.

The previous prime is 91509331. The next prime is 91509349. The reversal of 91509345 is 54390519.

It can be written as a sum of positive squares in 2 ways, for example, as 70358544 + 21150801 = 8388^2 + 4599^2 .

It is not a de Polignac number, because 91509345 - 2¹⁰ = 91508321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91509349) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 112570 + ... + 113379.

It is an arithmetic number, because the mean of its divisors is an integer number (8201985).

Almost surely, 2^91509345 is an apocalyptic number.

It is an amenable number.

91509345 is a deficient number, since it is larger than the sum of its proper divisors (72530355).

91509345 is a wasteful number, since it uses less digits than its factorization.

91509345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225966 (or 225957 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 91509345 is about 9566.0516933581. The cubic root of 91509345 is about 450.6317792626.

The spelling of 91509345 in words is "ninety-one million, five hundred nine thousand, three hundred forty-five".